One example of the present disclosure can include a system that can receive a first data set over a network from a first computing device, the first data set indicating user preference data and a first request for a shipping cost. The system can also receive a second data set over the network from the second computing device, the second data set indicating a first shipping cost generated by a shipping entity associated with the second computing device in response to the second request. Based on receiving the second data set, the system can determine a second shipping cost based on the user preference data and the first shipping cost. The system can then transmit the second shipping cost over the network to the first computing device, for example as part of a graphical user interface for display on the first computing device.